Electric-arc lamp.



PATENTED MAR. 28, 1905.

R. SCOTT.

ELECTRIC ARC LAMP.

APPLICATION FILED 001214, 903

2 SHEETSSHEET41.

32mmo I WM W/ A L No. 785,980. PATENTED MAR. 28, 1905.

R. SCOTT.

ELECTRIC ARC LAMP.

APPLICATION FILED 0OT.14, 1903 2 SHEETS-SHEET 2.

N0. 785,980.. Patented March 28, 1905,

\UNITED STATES PATENT OFFIcE.

RALPH SCOTT, OF ILKESBARRE, PENNSYLVANIA, ASSlGNOR OF ONE- HALF TO MARCUS A. MILLER, OF NEYV YORK, N. Y.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 785,980, dated March 28, 1905.

Application filed October 14. 1903. $eria1No. 177.011.

T0 (LU 107m it y OOYLCWWH 10, and the other end of said winding con- Beit known that 1, RALPH SCOTT, a citizen nects with a conductor 11, leading to lineof the United States, residing at WVilkesbarre, wire binding-post 12, carried by and insulated in the county of Luzerne and State of Pennfrom the casing 1. sylvania, have invented certain new and useful Vithin the cap 3 is arranged a suitable dash- Improvements in Electric-Arc Lamps; and I pot 13, whose plunger is formed from the do hereby declare the following to be a full, head of a carbon-pencil tube 1 1, positioned to clear, and exact description of the invention, i play vertically within the casing 1 and exsuch as will enable others skilled in the art to I tending down through the spool 5. The tube which it appertains to make and use the same. 1 1 is provided with a soft-iron plunger 15,

This invention relates to improvements in which surrounds said tube and is provided arc-lamps, and particularly to such as are eswith a set-screw 16 for securing the plunger pecially adapted for use in direct-current cirat any given point in the length of the tube. cuits; and the object in view is the provision The lower end of tube 14% is provided with of means for facilitating the adjustment of suitable clutch mechanism 17, adapted to enthe are, providing sufficient resistance for the gage the carbon pencil 18, arranged within the 5 circuit, and at the same time permitting free tube, said tube being guided in its vertical circulation of air about the moving system of movement by a spider 19, carried by a plate 20, the lamp. arranged in the lower end of easing 1. The

WVith this and further objects in view the plate 20 is provided with any suitable clampinvention comprises certain novel construcing device 21 forengaging the globe 22, inclos- 7 tions, combinations, and arrangements of ing the arc of the present improved lamp. parts, as will be hereinafter fully described The plate 20 also carries a stud 23, insulated and claimed. from such plate and carrying at its upper end In the accompanying drawings, Figure 1 a contact-spring 24:, adapted to be engaged by represents a longitudinal vertical central secaknife-switch 25,designed to be operated mantion through an arc-lamp embodying the fea ually by means of any suitable handle 26, said tures of the present invention. Fig. 2 repswitch 25 surrounding the end 27 of bracket resents an enlarged detail View in side eleva- 28, carried by and insulated from plate 20. tion of the contact-spring and carrying-stud The bracket 28 extends beneath the tube 1 1 for the switch. Fig. 3 represents a view simiand is designed to carry the carbon pencil 29, 8o lar to Fig. 1 of a slightly-modified form of adapted to complete the arc with the pencil 18. lamp. The end 27 is preferably threaded for receiv- Referring to the drawings by numerals, 1 ing nuts 30 and 31, one of said nuts being poindicates an inclosing casing adapted to be sitioned on each side of the switch 25, the end supported by any suitable means of attachof which surrounds the end portion of bracket 8 5 ment and carrying within its upper end a cap 28, said switch being adapted to swing upon 3, apertured, as at 4: 4, for purposes hereinsaid bracket as a pivot, contact being made after mentioned. The cap 1 carries at its between the switch and nuts 30 and 31 for eslower end a depending spool 5', of brass or tablishing electrical connection between such other suitable non-magnetic substance, upon switch and the bracket. A line-wire bindingwhich is wound a coil 6, inclosed by a softpost 32 is carried by and insulated from the iron cylinder or casing 7. The spool 5 is casing 1 and is connected with a conductor provided at its upper end with an internal .33, which is in turn connected with stud 23. annular flange 8, from which depend bars 9 9 The casing 1 consists, preferably, of an inof any preferred contour and formed of a nonclosing housing surrounding the elemcntsjust metallic conductive substance of high specific described and is provided at suitable points resistance. The bars 9 are connected in mulalong its length with apertures 3 1 3 1 for tiple with one end of winding 6 by conductor permitting circulation of air about the moving system about the lamp, such air passing, as indicated by the arrows, longitudinally through the spool 5 and through the apertures 1 in cap 3, so as to prevent any of the parts becoming heated. Any suitable standards or posts 35 may be employed to connect the spool 5 with the plate 20 for supporting such plate. i

In operation current flows from post 12 through conductor 11, coil 6, conductor 10, resistances 9, a portion of spool 5, cap 1, dashpot 13, tube 1 1, carbon 18 to carbon 29, forming the are, through bracket 28, switch 25, spring 24, stud 23, conductor 33 to bindingpost 32. When the current starts to flow, the carbons 18 and 29 being in contact, the flux from coil 6 will lift plunger 15 and through the action of clutch 17 will raise the carbon 18 for forming the are of proper length, such are varying with the movement of the carbon under the influence of the flux according to any variations of the current, the current taken by the lamp depending upon the position of the plunger 15 upon the tube 14. When it is desired to extinguish the lamp, all that is necessary is to bring handle 26 to one side for breaking contact with spring 2 1, and when it is desired to start the lamp again the handle need only to be swung to its former position for effecting such contact, the casing 2 being preferably formed with a horizontal slot for permitting the handle 26 to extend beyond the same for facilitating such operation.

It will be observed that among the many advantages gained by the present improved structure is the fact that the heat naturally occasioned by the flowing of acurrentthrough the resistances 9 will cause the air within the casing 1 to rise and pass out the uppermost apertures 34, cool air following the air thus discharged through lower apertures 3 1 and reducing the temperature of said resistances.

In Fig. 3 I have illustrated a slightly-modified form of the present improved structure and adapted the same for use in series, the principal difference between the two lamps illustrated being the presence of a high-resistance shunt-coil in the series lamp. As illustrated in Fig. 3, the particular form of lamp consists of a casing 35, inclosing a cap 36, carried centrally thereof at the upper end. WVithin the cap 36 is arranged a dash-pot 37 whose plunger is carried by the upper end of a vertically-movable carbon-pencil tube 38, which tube 38 is adapted to inclose a suitable carbon 39, electrically connected with tube 38 by means of a coiled or folded conductor 40 and a cap etl or in any other common or preferred manner. Surrounding the tube 38 is a plunger 42, adjustably connected with said tube by means of a set-screw 13, carried by said plunger. The lower end of the tube 38 extends into a guiding-spider 14 and carries a clutch mechanism as, adapted to engage the pencil 39 when the tube 38 is lifted and to release such pencil when the tube is lowered. Surrounding the plunger 42 is a spool 443 of brass or other suitable non-magnetic material. \Vound upon the spool a6 is a coil 4.7 of comparatively coarse wire and of but few convolutions, and beneath said coil 7 is wound a coil 18 of comparatively line wire and of a great number of convolutions. Incasing the coils 17 and 18 is a cylinder 419 of soft iron, which extends throughout the length of the spool and is supported in place and spaced from casing 35 by any suitable bolts or blocks 50 50, carried by said casing. Depending from the lower end of spool 46 are standards or supports 51 51, carrying a plate 52 at the lower end of the casing A bracket 53, corresponding in all respects to bracket 28, depends from plate 52, said bracket 53 being illustrated as broken away. A line wire binding-post 5 1 is carried by and insulated from frame 35 and is provided with a conductor 55, leading to and connected with the lower end of the bar 56, of non-metallic conductive material of comparatively high specific resistance, said bar being connected to a finger 57 at its upper end, said finger being carried by cap 36. A line-wire binding-post 57 is carried by and insulated from casing 35 and connected by a conductor 58 to one end of coil 17, a conductor 59 leading from the other end of said coil and connecting with bracket 53. One end of coil 18 is connected by a conductor 60 with one of the posts 51, and the other end of said coil is connected to a conductor 59. The circuit of the present lamp may be traced as follows: Starting with post 541, current flows through conductor 55, resistance 56, finger 57, cap 36, dashpot 37, tube 38, conductor 10, cap 11, carbon pencil 39, the carbon pencil carried by bracket 53, (not illustrated,) conductor 59, coil 4:7, conductor 58, and binding post 57. The shunt-coil 18 is connected across the are in such manner that current may flow from spool 416 through post 51, conductor 60, the coil 18, and conductor 59, the said coil being thus connected in shunt across the are and subjected to the voltage across the are. It will be observed that the current within the shunt-coil is adapted to maintain the plunger 12 in approximately the position indicated in the drawings, while the flux from a current in the coil 47 is designed to lift said plunger, whereby when the circuit is closed the carbon 39 will be lifted for forming the are. The two coils thus exert a differential action upon the plunger 42.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In an arc-lamp, the combination with a plurality of carbon-supports and means for spacing the same apart, of a circuit for said supports, a helix interposed in said circuit for IIO controlling said spacing means, and a resistance-bar interposed in the circuit and inclosed by said helix and spaced therefrom.

2. In an arc-lamp, the combination With a movable carbon-support and a fixed carbonsupport, of a plunger on said movable support, a circuit for said carbon-supports, a helix interposed in said circuit and surrounding said plunger for controlling the position of the same, and a non-metallic resistance interposed in said circuit and positioned between said plunger and helix.

3. In an arc-lamp, the combination with a movable carbon-support and' a fixed carbonsupport,of a plunger carried by said movable support, a circuit for said support, ahelix interposed in said circuit and surrounding said plunger for controlling the position of the same, and a bar of resistance material interposed in the circuit and arranged between said helix and plunger.

L. In an arc-lamp, the combination With a movably-mounted carbon-tube and a carbonsupport beneath the same, of a circuit for said tube and support, a spool surrounding said tube, an internal, annular flange formed on said spool, a coil surrounding said spool and interposed in said circuit, and a non-metallic resistance carried by said flange interposed in the circuit.

5. In an arc-lamp, the combination With a movably-mounted carbon-tube and a carbonsupport beneath the same, of a circuit for said tube and support, a spool surrounding said tube, an internal, annular flange upon the upper end of said spool, a bar of non-metallic, conductive material of high specific resistance secured to and depending from said flange and interposed in said circuit, and a coil surrounding said tube and also interposed in the circuit.

6. In an arc-lamp, the combination With a movably-mounted carbon-tube and a carbonsupport beneath the same, of a circuit for said tube and support, a spool surrounding said tube, a flange formed on said spool,acoil surrounding said spool and interposed in said circuit, and a resistance interposed in the said circuit and carried by said flange.

7. In an arc-lamp, the combination With a movably-mounted carbon-support and a fixed carbon-support, of a circuit for said supports, a spool surrounding said movable support, a coil carried by said spool and interposed in said circuit, and a resistance interposed in the circuit and arranged Within the spool.

In testimon whereof I hereunto aflix my signature in presence of tWo Witnesses.

RALPH SCOTT. Witnesses:

Anion M. MnYNns, OAssELL SEVERANOE. 

